James Brown’s “It’s a Man’s Man’s Man’s World” has been covered by dozens of artists — everyone from Christina Aguilera to Celine Dion, Glee to Grand Funk Railroad — and sampled just as many times, including in Michael Jackson’s “Bad” and 2Pac’s “Tradin’ War Stories.” But never has it been mashed up with the theme song for an HBO series about dragons. UNTIL NOW, thanks to some nifty editing work from “rozroz.”